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Each cluster of cores view it through dedicated address. This is used for SMP system where all CPUs synced by same clock source. Signed-off-by: Noam Camus Cc: Daniel Lezcano Cc: Rob Herring Cc: Thomas Gleixner Cc: John Stultz Acked-by: Vineet Gupta --- .../bindings/timer/ezchip,nps400-timer.txt | 11 ++++ drivers/clocksource/Kconfig | 7 ++ drivers/clocksource/Makefile | 1 + drivers/clocksource/timer-nps.c | 63 ++++++++++++++++++++ 4 files changed, 82 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/timer/ezchip,nps400-timer.txt create mode 100644 drivers/clocksource/timer-nps.c diff --git a/Documentation/devicetree/bindings/timer/ezchip,nps400-timer.txt b/Documentation/devicetree/bindings/timer/ezchip,nps400-timer.txt new file mode 100644 index 0000000..c5102c2 --- /dev/null +++ b/Documentation/devicetree/bindings/timer/ezchip,nps400-timer.txt @@ -0,0 +1,11 @@ +NPS Network Processor + +Required properties: + +- compatible : should be "ezchip,nps400-timer" + +Example: + +timer { + compatible = "ezchip,nps400-timer"; +}; diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 71cfdf7..98b12c5 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -131,6 +131,13 @@ config CLKSRC_TI_32K This option enables support for Texas Instruments 32.768 Hz clocksource available on many OMAP-like platforms. +config CLKSRC_NPS + bool "NPS400 clocksource driver" if COMPILE_TEST + select CLKSRC_OF if OF + help + NPS400 clocksource support. + Got 64 bit counter with update rate up to 1000MHz. + config CLKSRC_STM32 bool "Clocksource for STM32 SoCs" if !ARCH_STM32 depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST) diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index 56bd16e..20969b0 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -46,6 +46,7 @@ obj-$(CONFIG_CLKSRC_QCOM) += qcom-timer.o obj-$(CONFIG_MTK_TIMER) += mtk_timer.o obj-$(CONFIG_CLKSRC_PISTACHIO) += time-pistachio.o obj-$(CONFIG_CLKSRC_TI_32K) += timer-ti-32k.o +obj-$(CONFIG_ARC_PLAT_EZNPS) += timer-nps.o obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o obj-$(CONFIG_ARM_GLOBAL_TIMER) += arm_global_timer.o diff --git a/drivers/clocksource/timer-nps.c b/drivers/clocksource/timer-nps.c new file mode 100644 index 0000000..ef8f287 --- /dev/null +++ b/drivers/clocksource/timer-nps.c @@ -0,0 +1,63 @@ +/* + * Copyright(c) 2015 EZchip Technologies. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + */ + +#include +#include +#include +#include + +#define NPS_MSU_TICK_LOW 0xC8 +#define NPS_CLUSTER_OFFSET 8 +#define NPS_CLUSTER_NUM 16 + +static void *nps_msu_reg_low_addr[NPS_CLUSTER_NUM] __read_mostly; + +static cycle_t nps_clksrc_read(struct clocksource *clksrc) +{ + int cluster = raw_smp_processor_id() >> NPS_CLUSTER_OFFSET; + + return (cycle_t)ioread32be(nps_msu_reg_low_addr[cluster]); +} + +static struct clocksource nps_counter = { + .name = "EZnps-tick", + .rating = 301, + .read = nps_clksrc_read, + .mask = CLOCKSOURCE_MASK(32), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +static void __init nps_setup_clocksource(struct device_node *node) +{ + struct clocksource *clksrc = &nps_counter; + unsigned long rate, dt_root; + int ret, cluster; + + for (cluster = 0; cluster < NPS_CLUSTER_NUM; cluster++) + nps_msu_reg_low_addr[cluster] = + nps_host_reg((cluster << NPS_CLUSTER_OFFSET), + NPS_MSU_BLKID, NPS_MSU_TICK_LOW); + + dt_root = of_get_flat_dt_root(); + rate = (u32)of_get_flat_dt_prop(dt_root, "clock-frequency", NULL); + + ret = clocksource_register_hz(clksrc, rate); + if (ret) + pr_err("Couldn't register clock source.\n"); +} + +CLOCKSOURCE_OF_DECLARE(nps_400, "ezchip,nps400-timer", + nps_setup_clocksource);